The first computer to sing a song was the IBM 7094 in 1961. The song was "Daisy Bell," which i remember learning from my parents even before going to school. When we learned it in music class, that fact that I already knew it made me look just that much weirder to my classmates. This 1961 performance inspired the tense scene in 2001: A Space Odyssey in which the murderous HAL 9000 computer is deactivated.
As the supercomputer loses its working memory, it is left with only its earliest programming, including the song "Daisy Bell." And now we know why that song was used. (via Laughing Squid)